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Hydrometallurgy is a technique for extractive metallugry involving the three general area: leaching;solution concentration and purification; metal or metal compound recovery. Ion exchange technologies are usually used in the second area. Cation, anion, chelating ion exchange resins and adsorbent resins are all used to exchange cation, anion with the solution so as to enrich metals for recovery and reuse, or removal and disposal. This is a technology for metals resource recycling or impurities removal of high-purity metals.

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